Which number replaces the question mark?
2023
Which number replaces the question mark?
- A.
20
- B.
21
- C.
22
- D.
23
Attempted by 13 students.
Show answer & explanation
Correct answer: C
Rule: each term equals the sum of the two previous terms minus 4.
3 and 6 → 3 + 6 - 4 = 5
6 and 5 → 6 + 5 - 4 = 7
5 and 7 → 5 + 7 - 4 = 8
7 and 8 → 7 + 8 - 4 = 11
8 and 11 → 8 + 11 - 4 = 15
11 and 15 → 11 + 15 - 4 = 22. Therefore the missing number is 22.